Expulsom is a new important crafted material which binds when picked up. It is similar to the Blood of Sargeras in Legion Because they are both of Binds when picked up and Superior quality. Almost all professions need to use it.
How to get the Expulsom?
The Expulsom is a binds when picked up and cannot be traded, the player can get the material by scrapper Gears, and have a chance to get the Expulsom. The speed at which the Expulsom is acquired directly determines the amount of crafting gears in the crafting industry. The best way to get it is to scrapper the Uncommon and Rare gears. After the players' test with 900 pieces of Uncommon and Rare gears' continuously dismantled, 6-7 pieces of Uncommon and Rare gears can get one Expulsom. Of course, the higher the quality of the Gear, the higher the chance of getting a Expulsom.
This has led many players to buy a large number of BOE gears directly with Buying WoW gold in AH, and then make up 300-310 Gears for sale. These preparations are still very attractive for just full-level customers.

With this in mind, you can understand why an ordinary piece of Gear can sell more than 1,000 WOW gold.